Chapter 3 Molecular symmetry and symmetry point group
Chapter 3 Molecular symmetry and symmetry point group
Why do we study the symmetry concept? >The molecular configuration can be expressed more simply and distinctly. >The determination of molecular configuration is greatly simplified. >It assists giving a better understanding of the properties of molecules. >To direct chemical syntheses;the compatibility in symmetry is a factor to be considered in the formation and reconstruction of chemical bonds
The molecular configuration can be expressed more simply and distinctly. The determination of molecular configuration is greatly simplified. It assists giving a better understanding of the properties of molecules. To direct chemical syntheses; the compatibility in symmetry is a factor to be considered in the formation and reconstruction of chemical bonds. Why do we study the symmetry concept?
1 Symmetry elements and symmetry operations >Symmetry exists all around us and many people see it as being a thing of beauty. >A symmetrical object contains within itself some parts which are equivalent to one another. >The systematic discussion of symmetry is called Some objects are more symmetrical than others
§1 Symmetry elements and symmetry operations Symmetry exists all around us and many people see it as being a thing of beauty. A symmetrical object contains within itself some parts which are equivalent to one another. The systematic discussion of symmetry is called : Some objects are more symmetrical than others
1.Symmetry elements and symmetry operations symmetry operation .A action that leaves an object the same after it has been carried out is called symmetry operation. Example: Any rotation of sphere around axis through center brings sphere over into itself
symmetry operation •A action that leaves an object the same after it has been carried out is called symmetry operation. Any rotation of sphere around axis through center brings sphere over into itself Example: 1. Symmetry elements and symmetry operations
Example: 'b) (a)An NH3 molecule has a (b)an H2O molecule has a threefold (C3)axis twofold (C2)axis
(b) an H2O molecule has a twofold (C2) axis. (a) An NH3 molecule has a threefold (C3) axis Example: